US7729498B2 - Modulator processing for a parametric speaker system - Google Patents
Modulator processing for a parametric speaker system Download PDFInfo
- Publication number
- US7729498B2 US7729498B2 US11/651,944 US65194407A US7729498B2 US 7729498 B2 US7729498 B2 US 7729498B2 US 65194407 A US65194407 A US 65194407A US 7729498 B2 US7729498 B2 US 7729498B2
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- signal
- distortion
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- Expired - Fee Related, expires
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- 238000012545 processing Methods 0.000 title abstract description 8
- 230000005236 sound signal Effects 0.000 claims description 50
- 238000012937 correction Methods 0.000 claims description 36
- 230000004044 response Effects 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000013459 approach Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 description 20
- 230000008901 benefit Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2217/00—Details of magnetostrictive, piezoelectric, or electrostrictive transducers covered by H04R15/00 or H04R17/00 but not provided for in any of their subgroups
- H04R2217/03—Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
p(t)∝∂2/∂t2[(env(t))2]. (Equation 1)
This is called “Berktay's far-field solution” for a parametric acoustic array. Berktay looked at the far-field because the ultrasonic signals are no longer present there (by definition). The near-field demodulation produces the same audio signals, but there is also ultrasound present which must be included in a general solution. Since the near-field ultrasound isn't audible, it can be ignored and with this assumption, Berktay's solution is valid in the near-field too.
x i+1(t)=x i(t)−c i(M(x i(t))−x o(t))0, 1, 2, . . . , N−1 (Equation 2)
where M(·) is the channel model and x0(t) is defined as the input; x0(t)=x(t). Next, define the distortion generator system, D(·) as the difference between the channel model output and its input,
D(x i(t))=M(x i(t))−x i(t) (Equation 3)
Let the cancellation parameters be unity, ci=1 for all i. Note that D(xi(t)) is the distortion or error signal generated by the non-linear plant. It is zero only when the plant is distortion free. Combining equations (2) and (3), we get an alternative expression for the pre-distorted signals,
x i+1(t)=x 0(t)−D(x i(t))i=0, 1, 2, . . . , N−1 (Equation 4)
Equation 4 is depicted in
g(t)=h comp(t)*h(t) (Equation 5)
where “*” is the convolution operator, hcomp(t) is the compensation filter, and h(t) is the transducer response.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/651,944 US7729498B2 (en) | 1999-08-26 | 2007-01-09 | Modulator processing for a parametric speaker system |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/384,084 US6584205B1 (en) | 1999-08-26 | 1999-08-26 | Modulator processing for a parametric speaker system |
US10/393,893 US7162042B2 (en) | 1999-08-26 | 2003-03-21 | Modulator processing for a parametric speaker system |
US11/651,944 US7729498B2 (en) | 1999-08-26 | 2007-01-09 | Modulator processing for a parametric speaker system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/393,893 Continuation US7162042B2 (en) | 1999-08-26 | 2003-03-21 | Modulator processing for a parametric speaker system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080063214A1 US20080063214A1 (en) | 2008-03-13 |
US7729498B2 true US7729498B2 (en) | 2010-06-01 |
Family
ID=23515971
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/384,084 Expired - Lifetime US6584205B1 (en) | 1999-08-26 | 1999-08-26 | Modulator processing for a parametric speaker system |
US10/393,893 Expired - Lifetime US7162042B2 (en) | 1999-08-26 | 2003-03-21 | Modulator processing for a parametric speaker system |
US11/651,944 Expired - Fee Related US7729498B2 (en) | 1999-08-26 | 2007-01-09 | Modulator processing for a parametric speaker system |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/384,084 Expired - Lifetime US6584205B1 (en) | 1999-08-26 | 1999-08-26 | Modulator processing for a parametric speaker system |
US10/393,893 Expired - Lifetime US7162042B2 (en) | 1999-08-26 | 2003-03-21 | Modulator processing for a parametric speaker system |
Country Status (8)
Country | Link |
---|---|
US (3) | US6584205B1 (en) |
EP (1) | EP1210845A1 (en) |
JP (1) | JP2003507982A (en) |
CN (1) | CN1378764A (en) |
AU (1) | AU7333000A (en) |
CA (1) | CA2382986A1 (en) |
HK (1) | HK1047214A1 (en) |
WO (1) | WO2001015491A1 (en) |
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Also Published As
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CA2382986A1 (en) | 2001-03-01 |
US20080063214A1 (en) | 2008-03-13 |
US20030185405A1 (en) | 2003-10-02 |
CN1378764A (en) | 2002-11-06 |
US6584205B1 (en) | 2003-06-24 |
HK1047214A1 (en) | 2003-02-07 |
AU7333000A (en) | 2001-03-19 |
WO2001015491A9 (en) | 2002-09-06 |
US7162042B2 (en) | 2007-01-09 |
JP2003507982A (en) | 2003-02-25 |
EP1210845A1 (en) | 2002-06-05 |
WO2001015491A1 (en) | 2001-03-01 |
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